Add GetBool and SetBool (#19)

session/session.go

@@ -15,6 +15,10 @@ type Provider interface {
 	// not exist, the default or zero value will be returned (i.e, "").
 	GetString(key string) (string, error)
 
+	// GetBool returns a session value based on the provided key. If the key does
+	// not exist, the default or zero value will be returned (i.e, false).
+	GetBool(key string) (bool, error)
+
 	// GetBytes returns the []byte for a given key from the session data. If the key
 	// does not exist, the default or zero value will be returned (i.e, nil).
 	GetBytes(key string) ([]byte, error)
@@ -28,6 +32,9 @@ type Provider interface {
 	// SetString adds a key and the corresponding string value to the session data.
 	SetString(key string, value string) error
 
+	// SetBool adds a key and the corresponding boolean value to the session data.
+	SetBool(key string, value bool) error
+
 	// SetBytes adds a key and the corresponding []byte value to the session data.
 	SetBytes(key string, value []byte) error